A company has a High Speed internet connection (30 MB/s) which is enough for 10-15 computers. But for a week, there is almost no bandwidth "left", just checking email takes a long time or fails. Getting a website on screen is almost impossible. I checked with speedtest.net and now the speed is 3mb/s to 6 mb/s if not zero in the test time.

So the question is how I can monitor the in and out from the modem/router and analyze what IP take all the "juice" to take that bummer down in flame (or just find the program that make the internet choke). I have a Mac running 10.6.8 (the latest Snow Leopard release) and would like to better manage the network infrastructure and gain insight into how and when it becomes overloaded or performs poorly.

So in short, I need to track which IP or MAC address makes the most requests... And BTW, when there is no person at any computer (over the w-e) the line is fully used (as said by the internet provider (videotron) company) which is not supposed to happen!

NetUse monitor has been suggested by many, but I am still wondering about the features I need. Here is my problem and tell me how your software or other can help me.

Is there a way to get the LOG from the router ? and analyse it ?
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menardmamMar 26 '13 at 18:05

2

This isn't quite answerable yet since you haven't specified what router you use and what protocols it supports for logging (or SNMP). Yes, your Mac could run software that consumes the data that the router produces, but it's hard to recommend software without knowing some more details. Feel free to edit your question to read clearly what research you've done and what hardware / software needs are. (version of OS X and version of router software).
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bmike♦Mar 26 '13 at 18:31

It's an AirPort Extreme Base Station link to a Videotron modem (high speed) on cable. Cannot tell more than that
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menardmamMar 27 '13 at 2:33

OSX version all over the place is 10.6.8
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menardmamMar 27 '13 at 2:34

Total rewrite of the question does not lead to more answers :-(
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menardmamMar 27 '13 at 21:00